Limit the size of each request line

tests/microdot_asyncio/test_request_asyncio.py

@@ -89,6 +89,18 @@ class TestRequestAsync(unittest.TestCase):
         req = _run(Request.create('app', fd, 'addr'))
         self.assertIsNone(req.form)
 
+    def test_large_line(self):
+        saved_max_readline = Request.max_readline
+        Request.max_readline = 16
+
+        fd = get_async_request_fd('GET', '/foo', headers={
+            'Content-Type': 'application/x-www-form-urlencoded'},
+            body='foo=bar&abc=def&x=y')
+        with self.assertRaises(ValueError):
+            _run(Request.create('app', fd, 'addr'))
+
+        Request.max_readline = saved_max_readline
+
     def test_large_payload(self):
         saved_max_content_length = Request.max_content_length
         Request.max_content_length = 16
@@ -97,6 +109,6 @@ class TestRequestAsync(unittest.TestCase):
             'Content-Type': 'application/x-www-form-urlencoded'},
             body='foo=bar&abc=def&x=y')
         req = _run(Request.create('app', fd, 'addr'))
-        assert req.body == b''
+        self.assertEqual(req.body, b'')
 
         Request.max_content_length = saved_max_content_length